水泥注浆中六价铬总溶出量的影响因素研究

水泥注浆过程中析出液中的六价铬Cr(Ⅵ)易造成地下水的重金属污染,对生态和环境具有较大危害性,为了有效降低水泥注浆中Cr(Ⅵ)总溶出量,采用化学还原的方法,探讨了各种降铬剂及其掺量对降低Cr(Ⅵ)总溶出量的效果,研究了颗粒粒度、液固比对Cr(Ⅵ)总溶出量的影响.结果 表明,硫酸亚铁降铬剂的效果最显著,当用量在3％以内时...

Influencing Factors of Total Extraction Amount of Hexavalent Chromium in Cement Grouting

The hexavalent chromium Cr(Ⅵ)in the precipitated liquid during cement grouting is easy to cause heavy metal pollution in groundwater,which has great harm to ecology and environment.In order to effectively reduce the total amount of Cr(VI)dissolved in cement grouting,chemical reduction method was used to discuss the effect of various chromium reducing agents and their amounts on reducing the total amount of Cr(Ⅵ)dissolved.The influence of particle size and liquid-solid ratio on the total dissolution of Cr(Ⅵ)was studied.The results showed that the effect of the ferrous sulfate chromium reducing agent is the most significant,and the effect is best when the dosage is less than 3%.When the size is less than 15mm,the effect on the total dissolution of Cr(Ⅵ)is small.When the liquid-solid ratio is less than 10,the amount of dissolution increases with the increase of the liquid-solid ratio.When the liquid-solid ratio is greater than 10,the amount of dissolution tends to be stable.